Where there is already friction, having one group compel the other group to join a statutory road association may not go smoothly. This is a case where a professional Mediator could be a big help in getting people to listen to each other calmly and find common ground. Leah Boyd of Clarity Services, who has done workshops for MARA conferences, specializes in group mediations. I would strongly recommend you see if you can get her to help you work through this. It would be money well spent, and could help things get off to a smooth start rather than having tempers flare and then having to undo the damage later. If need be, I'd be willing to also attend, schedule permitting, (perhaps via Zoom,) to lend my expertise on how to go about forming a statutory road association. (No charge.) Having all parties understand the process can also help it go more smoothly.